Internal spline type rear power take-off forced lubrication device

Abstract

The utility model discloses an internal spline type rear power take-off forced lubrication device, and relates to the technical field of rear power take-off devices. Comprising a rear power take-off shell and a flywheel shell which are connected with each other; one end of the spline gear shaft is connected into the rear power take-off shell, and the other end of the spline gear shaft is connected into the flywheel shell; the flywheel shell is provided with a circulation channel communicated to an inner cavity of the flywheel shell, and the spline gear shaft is provided with a lubricating channel communicated to an inner cavity of the spline gear shaft. The lubricating assembly comprises a lubricating oil pipe fitting and a lubricating communicating piece; the lubricating oil pipe fitting is connected to the rear power take-off shell, and the lubricating communicating piece is installed in the circulation channel in a penetrating mode. The oil inlet end of the lubricating oil pipe fitting is communicated with a main oil duct of an engine body, and the oil outlet end of the lubricating oil pipe fitting is communicated with the lubricating communicating piece, so that lubricating oil in the main oil duct flows to an inner cavity of the spline gear shaft through the lubricating oil pipe fitting, the lubricating communicating piece and the lubricating channel for lubricating; and the internal spline of the spline gear shaft can be forcibly lubricated.

Description

Technical Field

[0001] This utility model belongs to the technical field of rear power take-off devices, specifically relating to an internal spline type rear power take-off forced lubrication device. Background Technology

[0002] A harvester is an agricultural machine primarily used for harvesting crops when they are ripe. A rear-take-off (RTO) device is installed at the rear of the harvester. The RTO's function is to drive a large-displacement hydraulic pump by connecting to the shaft of a hydraulic pump via a transmission gear. Existing technology mainly addresses the lubrication of the RTO, generally employing splash lubrication or forced lubrication. However, neither of these methods can adequately lubricate the internal spline gear shaft within the RTO, resulting in a lack of lubrication in the internal splines. This lack of lubrication can easily lead to wear of the internal splines under slight movement.

[0003] For example, patent application number 201320779714.8, entitled "A Rear Take-Off Lubrication Device," discloses a lubricating oil pipe with one end fixedly connected to the engine block oil passage outlet, and the other end extending from the engine block oil passage outlet towards the lubrication components of the rear take-off device. A nozzle is provided at the end of the lubricating oil pipe near the lubrication components of the rear take-off device, with several nozzles facing each lubrication component. Lubrication is achieved by spraying oil onto various components through the nozzles. The gears rely on splash lubrication from the lubricating oil inside the flywheel housing. This means it only lubricates the gears themselves, neglecting to lubricate the internal spline gear shaft, especially its internal components. Lubrication is crucial for the operation of the internal spline gear. Insufficient lubrication can lead to wear or fretting, and prolonged fretting can cause corrosion. Furthermore, if the heat generated by friction is not dissipated in time, it can easily cause overheating of components. In addition, insufficient lubrication can cause unstable operation of the transmission gears, generating noise and vibration, and in severe cases, it can affect the service life of the internal spline gear shaft, thus affecting the normal operation of the rear take-off device. Utility Model Content

[0004] This invention provides an internal spline type rear take-off forced lubrication device to solve the problem that the existing rear take-off device lubrication system only lubricates the gear part and does not lubricate the internal spline gear shaft and its interior, which can easily lead to wear and overheating due to insufficient lubrication.

[0005] The technical solution adopted in this utility model is as follows:

[0006] An internal spline type rear power take-off forced lubrication device includes:

[0007] The housing includes the connected rear power take-off housing and flywheel housing;

[0008] One end of the splined gear shaft is connected to the rear power take-off housing, and the other end of the splined gear shaft is connected to the flywheel housing; the flywheel housing has a flow channel communicating with the inner cavity of the flywheel housing, and the splined gear shaft has a lubrication channel communicating with the inner cavity of the splined gear shaft;

[0009] Lubrication components, including lubricating oil fittings and lubrication connectors;

[0010] The lubricating oil pipe is connected to the rear power take-off housing, and the lubrication connector is installed in the flow channel. The oil inlet end of the lubricating oil pipe is connected to the main oil passage of the engine block, and the oil outlet end of the lubricating oil pipe is connected to the lubrication connector, so that the lubricating oil in the main oil passage flows to the inner cavity of the splined gear shaft for lubrication through the lubricating oil pipe, the lubrication connector and the lubrication channel.

[0011] The internal spline type rear power take-off forced lubrication device of this utility model also has the following additional technical features:

[0012] The splined gear shaft includes a shaft body and a gear; the gear and the shaft body are connected as an integrated structure; the shaft body has a first cavity and a second cavity forming the inner cavity of the splined gear shaft, the first cavity does not have an internal spline, and the second cavity has an internal spline.

[0013] One end of the lubrication channel penetrates the inner wall of the first cavity, and the other end of the lubrication channel penetrates the circumferential surface of the spline gear shaft.

[0014] A cup-shaped plug is connected inside the first cavity to seal the opening of the first cavity, so as to prevent the lubricating oil entering the inner cavity of the spline gear shaft from leaking through the opening of the first cavity.

[0015] The angle between the projection of the lubrication channel along the axial direction of the splined gear shaft and the perpendicular direction passing through the center of the splined gear shaft is an acute angle.

[0016] The angle between the projection of the lubrication channel along the axis of the spline gear shaft and the perpendicular direction passing through the center of the spline gear shaft ranges from 5 to 20°.

[0017] The lubrication connector uses a hollow bolt; the oil outlet end of the lubricating oil pipe is connected to a fixing member, which has a connecting hole. The hollow bolt passes through the connecting hole and extends into the flow channel, where it is threadedly connected to the flow channel. The hollow bolt has a first lubrication hole in the radial direction and a second lubrication hole in the axial direction, which are connected to each other. The first lubrication hole is connected to the lubricating oil pipe, and the second lubrication hole is connected to the inner cavity of the flywheel housing, so that the lubricating oil enters the inner cavity of the flywheel housing through the lubricating oil pipe, the first lubrication hole, and the second lubrication hole.

[0018] There are sealing rings between the hollow bolt and the fastener, and between the fastener and the flywheel housing.

[0019] One end of the splined gear shaft is connected to the rear power take-off housing via a first bearing, and the other end of the splined gear shaft is connected to the flywheel housing via a second bearing.

[0020] An internal spline type rear power take-off forced lubrication device also includes a bearing cover, which is sealed to one side of the flywheel housing, and encapsulates the end of the spline gear shaft where the internal spline is located inside the bearing cover and the flywheel housing.

[0021] Due to the adoption of the above technical solution, the beneficial effects achieved by this utility model are as follows:

[0022] 1. This application relates to an internal spline-type rear take-off forced lubrication device, comprising a housing and a lubrication assembly. The housing includes a rear take-off housing and a flywheel housing connected together. One end of a spline gear shaft is connected to the rear take-off housing, and the other end is connected to the flywheel housing. The flywheel housing has a flow channel communicating with the inner cavity of the flywheel housing, and the spline gear shaft has a lubrication channel communicating with the inner cavity of the spline gear shaft. The lubrication assembly includes a lubricating oil pipe and a lubrication connector. The lubricating oil pipe is connected to the rear take-off housing, and the lubrication connector is inserted into the flow channel. The oil inlet end of the lubricating oil pipe is connected to the main oil passage of the engine block, and the oil outlet end of the lubricating oil pipe is connected to the lubrication connector, so that the lubricating oil in the main oil passage flows to the inner cavity of the spline gear shaft for lubrication through the lubricating oil pipe, the lubrication connector, and the lubrication channel. This device enables forced lubrication of the internal spline portion of the gear, changing the phenomenon of no lubrication for the internal spline, thereby avoiding wear caused by fretting of the internal spline and improving the service life of the entire rear take-off device.

[0023] 2. In a preferred embodiment of this utility model, one end of the lubrication channel penetrates the inner wall of the first cavity, and the other end of the lubrication channel penetrates the circumferential surface of the splined gear shaft. Under the action of the centrifugal force of the high-speed rotation of the splined gear shaft, the lubricating oil entering the lubrication channel can flow into the inner cavity of the splined gear shaft along the lubrication channel, flowing from the first cavity to the second cavity, providing comprehensive and sufficient lubrication to both the first cavity and the second cavity with the internal spline, thus achieving the effect of forced lubrication of the internal spline.

[0024] 3. In a preferred embodiment of this utility model, a cup-shaped plug is connected inside the first cavity to seal the opening of the first cavity, preventing lubricating oil entering the inner cavity of the splined gear shaft from leaking through the opening. The lubricating oil flowing into the first cavity can not only lubricate the inner cavity of the splined gear shaft within the first cavity, but also flow along the first cavity to the second cavity under the sealing effect of the cup-shaped plug, thus providing sufficient lubrication to the internal splines in the second cavity and achieving forced lubrication of the internal splines.

[0025] 4. In a preferred embodiment of this utility model, the angle between the extension direction of the projection of the lubrication channel along the axial direction of the spline gear shaft and the perpendicular direction passing through the center of the spline gear shaft is an acute angle. The lubrication channel is inclined in the radial direction of the spline gear shaft to form a wedge-shaped oil film, which can be continuously replenished as the spline gear shaft rotates, resulting in a more uniform pressure distribution and further improved oil film stability.

[0026] 5. In a preferred embodiment of this utility model, the lubrication connector is a hollow bolt; the oil outlet end of the lubricating oil pipe is connected to a fixing member, which has a connecting hole. The hollow bolt passes through the connecting hole and extends into the flow channel, where it is threadedly connected. The hollow bolt has a first lubrication hole in the radial direction and a second lubrication hole in the axial direction, which are connected. The purpose of the fixing member is to enable the lubricating oil pipe to be fixedly connected to the hollow bolt and to allow the lubricating oil from the lubricating oil pipe to flow through the flow port to the first lubrication hole of the hollow bolt, and then through the second lubrication hole to the lubrication channel, flowing along the lubrication channel to the interior of the splined gear shaft for lubrication, and also to lubricate the internal splines of the splined gear shaft. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0028] Figure 1 This is a schematic diagram of the structure of an internal spline type rear power take-off forced lubrication device according to one embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the internal structure of the splined gear shaft of an internal splined rear power take-off forced lubrication device according to one embodiment of the present invention.

[0030] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at point AA;

[0031] Figure 4 This is a schematic diagram of a rear power take-off lubrication device in the prior art;

[0032] in,

[0033] 1. Rear take-off housing; 2. First bearing; 3. Splined gear shaft; 4. Flywheel housing; 5. Second bearing; 6. Bearing cover; 7. Lubricating oil fittings; 8. Sealing ring; 9. Lubrication connector; 10. Cup-shaped plug; 11. Fixing component; 12. Lubricating oil pipe; 13. Nozzle; 131. Nozzle head;

[0034] α is the angle between the projection of the lubrication channel along the axial direction of the splined gear shaft and the perpendicular direction passing through the center of the splined gear shaft;

[0035] R represents the direction of rotation of the splined gear shaft. Detailed Implementation

[0036] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0037] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "a particular embodiment," "example," or "specific example," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Figure 4The diagram shows a schematic of an existing rear take-off lubrication device. It discloses that the lubricating oil pipe 12 has a nozzle 13 at one end near the lubrication part of the rear take-off device. The nozzle 13 is equipped with several nozzles 131, which are respectively directed towards the various lubrication parts of the rear take-off device. However, it only lubricates the gear part and does not lubricate the inside of the gear, especially the internal spline part. Therefore, this application proposes an internal spline type forced lubrication device for rear take-off, which can provide forced lubrication for the internal spline part of the gear, change the phenomenon that the internal spline is not lubricated, thereby avoiding wear caused by the internal spline under micro-movement and improving the service life of the entire rear take-off device.

[0040] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0041] Definition of proper nouns:

[0042] Internal spline gear shaft: A type of gear structure in which the center of the shaft is designed with an internal spline structure, which can provide power output to the outside.

[0043] Rear take-off (PTO): A power take-off device located on the engine gear chamber or flywheel housing. It is typically integrated with internal splined gear shafts, bearings, etc., to provide power to external components.

[0044] This utility model relates to an internal spline type rear power take-off forced lubrication device, such as... Figure 1-3 As shown, it includes:

[0045] The housing includes a rear power take-off housing 1 and a flywheel housing 4 connected together;

[0046] One end of the splined gear shaft 3 is connected to the rear power take-off housing 1, and the other end of the splined gear shaft 3 is connected to the flywheel housing 4; the flywheel housing 4 has a flow channel communicating with the inner cavity of the flywheel housing 4, and the splined gear shaft 3 has a lubrication channel communicating with the inner cavity of the splined gear shaft 3.

[0047] The lubrication assembly includes a lubricating oil pipe 7 and a lubrication connector 9;

[0048] The lubricating oil pipe 7 is connected to the rear power take-off housing 1, and the lubrication connecting piece 9 is installed in the flow channel. The oil inlet end of the lubricating oil pipe 7 is connected to the main oil passage of the engine block, and the oil outlet end of the lubricating oil pipe 7 is connected to the lubrication connecting piece 9, so that the lubricating oil in the main oil passage flows to the inner cavity of the spline gear shaft 3 for lubrication through the lubricating oil pipe 7, the lubrication connecting piece 9 and the lubrication channel.

[0049] like Figure 1As shown in the diagram, the left side represents the rear power take-off housing 1, and the right side represents the flywheel housing 4. The rear power take-off housing 1 and the flywheel housing 4 are connected, forming a cavity. A splined gear shaft 3 is housed within this cavity. The left end of the splined gear shaft 3 is connected to the rear power take-off housing 1 via a bearing, and the right end is connected to the flywheel housing 4 via a bearing. The rear power take-off gear chamber consists of gears, master and slave shafts, bearings, oil seals, etc. The gear is the core component of the rear power take-off gear chamber; its function is to convert the power output from the mixer truck engine into the required speed and torque, transmitting it to the mixer truck's working device. Power output is achieved through gear transmission. When the mixer truck engine generates power, this power is first transmitted to the rear power take-off gear chamber, and then distributed to the front and rear rotors via gear transmission, giving the mixer truck strong traction and working capacity. The left end of the splined gear shaft 3 can be located within the gear chamber of the rear power take-off housing 1, enabling power output for the rear power take-off device.

[0050] Traditional rear take-off (PTO) devices typically only lubricate the end faces of the gears, leaving the internal cavities, especially those involving internal splines, unlubricated. Therefore, this application proposes an internal spline-type forced lubrication device for PTO that can lubricate the internal splines within the cavity of the splined gear shaft 3. A flow channel is provided on the flywheel housing 4, and a lubrication channel is provided on the splined gear shaft 3. This lubrication channel connects to the internal cavity of the splined gear shaft 3. A lubrication connector 9 is connected to the flow channel, and this connector 9 is connected to a lubrication oil pipe 7 that connects to the main oil passage. Thus, lubricating oil can enter the flywheel housing 4 through the lubrication connector 9 and the lubrication pipe 7. The lubricating oil inside the flywheel housing 4 can then enter the internal cavity of the splined gear shaft 3 through the lubrication channel during its rotation. This allows the lubricating oil in the main oil passage to overcome centrifugal force and enter the internal cavity of the splined gear shaft 3, achieving effective lubrication of the splined gear shaft 3 while it rotates, thereby improving the service life of the splined gear shaft 3 and the entire PTO device.

[0051] In a preferred embodiment, the spline gear shaft 3 includes a shaft body and a gear; the gear is connected to the shaft body in an integrated structure; the shaft body has a first cavity and a second cavity forming the inner cavity of the spline gear shaft 3, the first cavity does not have an internal spline, and the second cavity has an internal spline.

[0052] like Figure 2 As shown, the splined gear shaft 3 includes a shaft body and a gear. The gear is connected to the outer side of the shaft body, and the gear is integrally connected to the shaft body. The inner cavity of the splined gear shaft 3 includes a first cavity and a second cavity, which are connected to each other. Located in... Figure 2As shown, the first cavity is located at the left end of the splined gear shaft 3, and the second cavity is located at the right end of the splined gear shaft 3. The first cavity does not have an internal spline, while the second cavity does. The first and second cavities are connected axially to form the inner cavity of the splined gear shaft 3. The gear is correspondingly connected to the outer circumferential surface outside the first cavity of the splined gear shaft 3. The side of the gear located at the left end is rotatably connected to the rear power take-off housing 1 via a bearing. The side of the gear located at the right end also has a stepped surface, and one end of the bearing can contact and connect to the stepped surface to connect the right end of the gear to the flywheel housing 4 via the bearing.

[0053] In a preferred embodiment, one end of the lubrication channel penetrates the inner wall of the first cavity, and the other end of the lubrication channel penetrates the circumferential surface of the spline gear shaft 3.

[0054] like Figure 1 and Figure 3 As shown, the lubrication channel can penetrate the splined gear shaft 3. The lubrication channel has an inlet end and an outlet end. The inlet end is opened on the circumferential surface of the splined gear shaft 3, and the outlet end of the lubrication channel is located on the wall of the first cavity of the splined gear shaft 3. This allows the lubrication channel to penetrate the inside and outside of the splined gear shaft 3. Under the action of the centrifugal force of the high-speed rotation of the splined gear shaft 3, the lubricating oil entering the flywheel housing 4 can enter the lubrication channel and flow from the inlet end to the outlet end into the inner cavity of the splined gear shaft 3. Then, it flows from the first cavity to the second cavity, providing comprehensive and sufficient lubrication to the first cavity and the second cavity with internal splines of the splined gear shaft 3, thus playing the role of forced lubrication of the internal splines.

[0055] The lubrication channel is connected to the first cavity. The purpose of setting the lubrication channel in the non-load-bearing area of ​​the spline gear shaft 3 is to ensure the continuity of the oil film in the load-bearing area of ​​the spline gear shaft 3, thereby achieving lubrication of the entire interior of the spline gear shaft 3 and the internal spline in the second cavity.

[0056] In a preferred embodiment, a bowl-shaped plug 10 is connected inside the first cavity to seal the opening of the first cavity, thereby preventing the lubricating oil entering the inner cavity of the spline gear shaft 3 from leaking through the opening of the first cavity.

[0057] Since the lubricating oil enters the first cavity of the spline gear shaft 3, and one end of the first cavity has an opening, in order to prevent the lubricating oil from leaking from the opening of the first cavity, a cup-shaped plug 10 is connected to the opening end of the first cavity. The cup-shaped plug 10 can be inserted into the opening end of the first cavity and is interference-fitted with the inner wall of the first cavity, thereby sealing the opening of the first cavity. This allows the lubricating oil flowing into the first cavity to flow in the first cavity without flowing out from the opening of the first cavity. Under the sealing effect of the cup-shaped plug 10, it can also flow along the first cavity to the second cavity, fully lubricating the internal spline in the second cavity, thus providing forced lubrication for the internal spline.

[0058] In a preferred embodiment, the angle between the extension direction of the projection of the lubrication channel along the axial direction of the spline gear shaft 3 and the vertical direction passing through the center of the spline gear shaft 3 is an acute angle.

[0059] like Figure 3 As shown, the extension direction of the projection of the lubrication channel along the axial direction is set at a certain angle to the perpendicular direction of the spline gear shaft 3 passing through the center. That is, the lubrication channel is inclined in the radial direction of the spline gear shaft 3 to form a wedge-shaped oil film. Figure 3 As shown, R is the rotation direction of the spline gear shaft 3. The wedge-shaped oil film can be continuously replenished as the spline gear shaft 3 rotates, so that the pressure distribution is uniform and the oil film stability is further improved. In addition, the inclined lubrication channel can reduce the resistance when the oil passes through. Especially when running at low speed, the inclined lubrication channel can improve the oil intake effect, thereby satisfying the full lubrication of the inner spline part of the spline gear shaft 3 at low speed.

[0060] In order to achieve the formation of a good wedge-shaped oil film, which has good load-bearing capacity and stability and can effectively reduce friction and wear, preferably, the angle α between the extension direction of the projection of the lubrication channel along the axial direction of the spline gear shaft 3 and the vertical direction through the center of the spline gear shaft 3 is set to a range of 5 to 20°.

[0061] In a preferred embodiment, the lubrication connector 9 is a hollow bolt; the oil outlet end of the lubricating oil pipe 7 is connected to a fixing member 11, which has a connecting hole. The hollow bolt passes through the connecting hole and extends into the flow channel to be threadedly connected to the flow channel; the hollow bolt has a first lubrication hole in the radial direction and a second lubrication hole in the axial direction, and the first lubrication hole and the second lubrication hole are connected; the first lubrication hole is connected to the lubricating oil pipe 7, and the second lubrication hole is connected to the inner cavity of the flywheel housing 4, so that the lubricating oil enters the inner cavity of the flywheel housing through the lubricating oil pipe 7, the first lubrication hole, and the second lubrication hole.

[0062] like Figure 1As shown, the lubrication connector 9 uses a hollow bolt with threads. The hollow bolt is threaded into the flow channel. Because the hollow bolt has a hollow internal structure, it has a second lubrication hole along its axial direction. This second lubrication hole is connected to the flow channel, allowing lubricating oil from the second lubrication hole to flow into the flywheel housing 4 and then into the lubrication channel. The lubricating oil enters the hollow bolt through a first lubrication hole opened radially. This first lubrication hole extends along both sides of the hollow bolt and is connected to the second lubrication hole, allowing the lubricating oil to flow within the second lubrication hole after entering through the first.

[0063] A hollow bolt is connected to the lubricating oil fitting 7. Specifically, a columnar fixing member 11 is connected to one side of the oil outlet end of the lubricating oil fitting 7. The fixing member 11 has a slot that extends through both sides of the fixing member 11 along its axial direction. Therefore, the hollow bolt can be inserted into the slot and extended into the flow channel for threaded connection with the flow channel. Thus, the fixing member 11 is fastened to the flywheel housing 4 by the hollow bolt. The fixing member 11 is fixedly connected to the oil outlet end of the lubricating oil fitting 7. The oil outlet of the lubricating oil fitting 7 is connected to the slot, allowing the lubricating oil flowing out of the lubricating oil fitting 7 to enter the first lubrication hole through the slot. In practical applications, the first lubrication hole opened radially by the hollow bolt can also be aligned with the oil outlet of the lubricating oil fitting 7. The lubricating oil fitting 7 is fixedly connected to the hollow bolt through the fastener. The lubricating oil of the lubricating oil fitting 7 flows through the oil outlet to the first lubrication hole of the hollow bolt, and then flows through the first lubrication hole to the second lubrication hole, thereby causing the lubricating oil to flow from the second lubrication hole to the lubrication channel to lubricate the internal spline of the spline gear shaft 3.

[0064] In a preferred embodiment, a sealing ring 8 is provided between the hollow bolt and the fastener 11, and between the fastener 11 and the flywheel housing 4.

[0065] When the hollow bolt is inserted into the fixing member 11, sealing rings 8 are connected between the fixing member and the flywheel housing 4 and between the hollow bolt and the fixing member 11, respectively. This strengthens the connection between the fixing member 11 and the flywheel housing 4, and between the hollow bolt and the fixing member 11, and enhances the sealing performance between the fixing member 11, the hollow bolt, and the flywheel housing 4, preventing lubricating oil from leaking between the lubricating oil pipe 7 and the hollow bolt, and between the lubricating oil pipe 7 and the flywheel housing 4.

[0066] In a preferred embodiment, one end of the spline gear shaft 3 is connected to the rear power take-off housing 1 via the first bearing 2, and the other end of the spline gear shaft 3 is connected to the flywheel housing 4 via the second bearing 5.

[0067] The first bearing 2 is a cylindrical roller bearing, and the second bearing 5 is a deep groove ball bearing. After lubrication of the splines inside the splined gear shaft 3, the lubricating oil can flow back into the main oil passage inside the engine block through the deep groove ball bearing for the next cycle of lubrication, thereby saving energy and improving the utilization rate of lubricating oil.

[0068] As a preferred embodiment, an internal spline type rear power take-off forced lubrication device further includes a bearing cover 6, which is sealed to one side of the flywheel housing 4, and encapsulates the end of the spline gear shaft 3 where the internal spline is located inside the bearing cover 6 and the flywheel housing 4.

[0069] like Figure 1 As shown, the bearing cover 6 is connected to the right side of the flywheel housing 4, which can seal the flywheel housing 4, thereby encapsulating the spline gear shaft 3 in the space formed by the flywheel housing 4, the rear power take-off housing 1 and the bearing cover 6, limiting the right side of the spline gear shaft 3, and preventing lubricating oil from leaking to the outside from the right end opening of the spline gear shaft 3.

[0070] Existing rear take-off lubrication systems only lubricate the gear section, relying on splash lubrication within the flywheel housing. Lubricating oil cannot penetrate the internal splines, resulting in a lack of forced lubrication for the internal spline gear shaft 3. This application discloses an internal spline-type rear take-off forced lubrication device that introduces lubricating oil into the spline gear shaft 3, generating pressure that forces the oil to lubricate the internal splines. Furthermore, this application optimizes the structure of the spline gear shaft 3, for example, by connecting a cup-shaped plug 10 in the first cavity to prevent oil leakage. Simultaneously, the high-speed centrifugal force of the liquid forms a pressurized cylindrical ring of lubricating oil inside the spline gear shaft 3, forcing the oil to flow through the internal splines and out, thus achieving forced lubrication. This application improves the structure of the spline gear shaft 3 and the flywheel housing 4, enabling lubricating oil to flow from the engine's main oil passage to the inside of the spline gear shaft 3 for lubrication. This ensures timely oil flow and allows the oil to participate in the normal internal circulation of the engine. The design is simple, requires no additional pressurization device, and is low-cost.

[0071] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0072] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0073] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. An internal spline type rear power take-off forced lubrication device, characterized in that, include: The housing includes a rear take-off housing (1) and a flywheel housing (4) connected to each other; One end of the spline gear shaft (3) is connected to the rear power take-off housing (1), and the other end of the spline gear shaft (3) is connected to the flywheel housing (4); the flywheel housing (4) has a flow channel that connects to the inner cavity of the flywheel housing (4), and the spline gear shaft (3) has a lubrication channel that connects to the inner cavity of the spline gear shaft (3); The lubrication assembly includes a lubricating oil pipe (7) and a lubrication connector (9); The lubricating oil pipe (7) is connected to the rear power take-off housing (1), and the lubrication connector (9) is installed in the flow channel. The oil inlet end of the lubricating oil pipe (7) is connected to the main oil passage of the engine block, and the oil outlet end of the lubricating oil pipe (7) is connected to the lubrication connector (9) so that the lubricating oil in the main oil passage flows to the inner cavity of the spline gear shaft (3) for lubrication through the lubricating oil pipe (7), the lubrication connector (9) and the lubrication channel.

2. The internal spline type rear power take-off forced lubrication device according to claim 1, characterized in that, The spline gear shaft (3) includes a shaft body and a gear; the gear is connected to the shaft body in an integrated structure; the shaft body has a first cavity and a second cavity forming the inner cavity of the spline gear shaft (3), the first cavity does not have an internal spline, and the second cavity has an internal spline.

3. The internal spline type rear power take-off forced lubrication device according to claim 2, characterized in that, One end of the lubrication channel penetrates the inner wall of the first cavity, and the other end of the lubrication channel penetrates the circumferential surface of the spline gear shaft (3).

4. The internal spline type rear power take-off forced lubrication device according to claim 2, characterized in that, A bowl-shaped plug (10) is connected inside the first cavity. The opening of the first cavity is sealed by the bowl-shaped plug (10) to prevent the lubricating oil entering the inner cavity of the spline gear shaft (3) from leaking through the opening of the first cavity.

5. The internal spline type rear power take-off forced lubrication device according to claim 1, characterized in that, The angle between the projection of the lubrication channel along the axial direction of the spline gear shaft (3) and the perpendicular direction passing through the center of the spline gear shaft (3) is acute.

6. The internal spline type rear power take-off forced lubrication device according to claim 5, characterized in that, The angle between the projection of the lubrication channel along the axial direction of the spline gear shaft (3) and the perpendicular direction passing through the center of the spline gear shaft (3) is in the range of 5 to 20°.

7. The internal spline type rear power take-off forced lubrication device according to claim 1, characterized in that, The lubrication connector (9) uses a hollow bolt; the oil outlet end of the lubricating oil pipe (7) is connected to a fixing part (11), the fixing part (11) has a connecting hole, and the hollow bolt passes through the connecting hole and extends into the flow channel to be threadedly connected to the flow channel. The hollow bolt has a first lubrication hole along the radial direction and a second lubrication hole along the axial direction. The first lubrication hole and the second lubrication hole are connected. The first lubrication hole is connected to the lubricating oil pipe (7), and the second lubrication hole is connected to the inner cavity of the flywheel housing (4), so that the lubricating oil enters the inner cavity of the flywheel housing through the lubricating oil pipe (7) and the first lubrication hole and the second lubrication hole.

8. The internal spline type rear power take-off forced lubrication device according to claim 7, characterized in that, A sealing ring (8) is connected between the hollow bolt and the fastener (11) and between the fastener (11) and the flywheel housing (4).

9. The internal spline type rear power take-off forced lubrication device according to claim 1, characterized in that, One end of the spline gear shaft (3) is connected to the rear power take-off housing (1) through the first bearing (2), and the other end of the spline gear shaft (3) is connected to the flywheel housing (4) through the second bearing (5).

10. The internal spline type rear power take-off forced lubrication device according to claim 1, characterized in that, It also includes a bearing cover (6), which is sealed to one side of the flywheel housing (4) and encapsulates the end of the splined gear shaft (3) containing the internal spline inside the bearing cover (6) and the flywheel housing (4).

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